National Dental Examining Board of Canada (NDEB) Practice Exam 2026 - Free NDEB Practice Questions and Study Guide

Acquired xerostomia, also known as dry mouth, is the primary etiological factor for the development of root caries. Poor dental hygiene and a high sugar diet can contribute to the development of cavities and other dental problems, but they are not the primary cause for root caries. Additionally, while genetics can play a role in an individual's susceptibility to cavities, there is no specific gene or genetic predisposition for root caries. Therefore, options A, B, and D are incorrect as they are not the primary etiological factor for root caries.